2018-01-31_PERMIT FILE - C1981019A ‎(8)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 1/31/2018
• Doc Name: West Taylor Sedimentation Pond
• Section_Exhibit Name: Exhibit 07 Item 20 Part C -ST
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
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Velocity and Manning's n calculations may not apply for this method.
Structure #3 (Null
Nu//Above West Tay/or Pond
Structure #Z (Pond1
West Tay/or Pond
Pond Inputs:
Initial Pool Elev:
w/o Freeboard w/ Freeboard
X -Section Area:
0.71 sq ft
Hydraulic Radius:
0.057 ft
Froude Number*:
0.00%
Manning's n*:
43.69%
Dmin:
3.00 in
D50:
9.00 in
Dmax:
11.25 in
Velocity and Manning's n calculations may not apply for this method.
Structure #3 (Null
Nu//Above West Tay/or Pond
Structure #Z (Pond1
West Tay/or Pond
Pond Inputs:
Initial Pool Elev:
7,471.00 ft
Initial Pool:
2.90 ac -ft
*Sediment Storage:
0.00 ac -ft
Dead Space:
0.00%
*No sediment capacity defined
Emergency Spillway
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
7,475.80 30.00 2.00:1 2.00:1 30.00
Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length (ft) (%) � Mannings n (ft) Holes per
(in) (in) Elev
18.00 10.50 18.00 150.00 2.00 0.0150 7,471.00
Pond Results:
Peak Elevation:
7,473.74 ft
H'graph Detention Time:
0.77 hrs
Pond Model:
CSTRS
Dewater Time:
0.70 days
Trap Efficiency:
43.69%
17
Dewatering time is calculated from peak stage to lowest spillway
Filename: TR -117 Post Mining 10 YR 24 HR.sc4 Printed 11-10-2017